US5135336A - Cutting-off tool - Google Patents

Cutting-off tool Download PDF

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Publication number
US5135336A
US5135336A US07/552,686 US55268690A US5135336A US 5135336 A US5135336 A US 5135336A US 55268690 A US55268690 A US 55268690A US 5135336 A US5135336 A US 5135336A
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US
United States
Prior art keywords
cutting
cutting edge
tool
chamfered
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/552,686
Inventor
Kazuo Noguchi
Keiji Hirose
Sunao Setoguchi
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Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD. reassignment SUMITOMO ELECTRIC INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HIROSE, KEIJI, NOGUCHI, KAZUO, SETOGUCHI, SUNAO
Application granted granted Critical
Publication of US5135336A publication Critical patent/US5135336A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/04—Cutting-off tools
    • B23B27/045—Cutting-off tools with chip-breaking arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D13/00—Tools or tool holders specially designed for planing or slotting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/02—Fixation using an elastically deformable clamping member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/25—Cutters, for shaping including cut off tool

Definitions

  • This invention relates to a cutting-off tool.
  • a cutting-off operation by a cutting-off tool poses peculiar problems. For example, as shown in FIG. 4: 1) Part A' of material A drops after being cut off. 2) When a cutting-off tool B is pulled back straight after moved forward for cutting-off, it tends to be abraded by contact with the material A being machined which is rotating by inertia, on a supporting chuck.
  • FIG. 5 shows a prior art cutting-off tool B.
  • This tool B has an insert 1' brazed to a shank.
  • a throw away type tool is also known in which the insert is detachable.
  • the cutting insert of the prior art cutting-off tool B has front and side cutting edges 4, 5 and 6 identical in shape to each other, it is difficult to evade both of the above-described problems caused to the side cutting edges 5 and 6.
  • one of the cutting edges at one side is chamfered by a width H 1 whereas the cutting edge at the other side is chamfered by a width H 2 and the widths H 1 and H 2 satisfy the following relations: H 1 ⁇ H 2 , H 1 >0.01 mm, H 2 ⁇ 0.5 mm
  • a cutting edge can be strengthened by chamfering it.
  • the side cutting edge at one side which may possibly collide with a falling material is chamfered by an amount H 1 (0.01 mm or more) which is larger than the amount by which the side cutting edge at the other side is chamfered to increase its resistance to breakage.
  • H 1 0.01 mm or more
  • the side cutting edge at the other side has a chamfer amount H 2 which is smaller than H 1 within the range of 0.5 mm or less to keep its sharpness, the material to be machined will be ground if the tool gets into contact with the material when it returns to its original position. Thus wear owing to abrasion and welding will decrease.
  • the chamfer amount H 1 of the first-mentioned side cutting edge is limited to 0.01 mm or over. This is because though the smaller the H 1 value, the higher the sharpness of the edge, experimental results revealed that if the H 1 value is less than 0.01 mm, the edge tends to be broken more easily. Also, although the larger the H 2 value, the higher the strength of the edge, if the H 2 value is more than 0.5 mm, the sharpness of the edge is reduced remarkably.
  • the side cutting edge which may collide with the material to be machined is chamfered sufficiently to prevent it from being broken, whereas the other side cutting edge is chamfered to a lesser degree to assure its sharpness.
  • the former side cutting edge is prevented from breaking and the other side edge is effectively prevented from wearing and welding. This will assure effective use of the tool.
  • FIG. 1 is a perspective view of an embodiment according to this invention
  • FIG. 2 is an enlarged plan view of the insert showing its edge
  • FIG. 3 is a sectional view taken along line III--III of FIG. 2;
  • FIG. 4 is a perspective view showing how a material is cut off
  • FIG. 5 is a perspective view of a prior art cutting-off tool
  • FIG. 6 is a diagram of a side cutting edge showing its round honed shape.
  • FIG. 7 is a diagram of a front cutting edge showing its round honed shape.
  • FIGS. 1 to 3 show a throw away cutting-off tool embodying this invention.
  • the insert 1 has a front cutting edge 4 formed by the ridge line defined by a rake face 2 and a front flank 3, and side cutting edges 5 and 6 having their front ends connecting to both ends of the front cutting edge 4.
  • the side cutting edge 5 at one side is formed by the ridge line defined by a side flank 7 and the rake face 2 and is subjected to round honing so as to be chamfered by a width H 2 (FIG. 3).
  • the side cutting edge 6 at the other side is formed by the ridge line defined by a side flank 8 and the rake face 2 and is subjected to round honing so as to be chamfereed by a width H 1 .
  • the chamfered surface may be flat. In either case, the H 1 and H 2 values should be determined to meet the requirements that the minimum value of H 1 is 0.01 mm, the maximum value of H 2 is 0.5 mm, and H 1 >H 2 .
  • numeral 9 designates a chip breaker groove. It serves to deform the chips in such a direction as to separate than from the surface to be machined. This facilitates chip discharge.
  • FIG. 6 shows a preferable shape of the chamfer of the side cutting edges 5 and 6 formed by round honing.
  • FIG. 7 shows a preferable shape of the chamfer of the front cutting edge 4 formed by round honing.
  • R 0 is larger than R 1 and R 2 .
  • R 1 should be 0.04-0.06 mm
  • H 3 should be 0.08-0.12 mm
  • ⁇ 1 should be 8-15 degrees.
  • Such a round honed surface can be machined by pressing a disk-shaped brush grindstone with resin filaments containing diamond grains so that the filaments will contact the flank first and move off the insert from the rake face.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Drilling Tools (AREA)

Abstract

A cutting-off tool having an insert having two side cutting edges formed by the ridge lines defined by a rake face and side flanks. These edges are chamfered so that the cutting edge at one side which is likely to hit the falling part of the material cut off is chamfered by a larger width than at the other side.

Description

This invention relates to a cutting-off tool.
A cutting-off operation by a cutting-off tool poses peculiar problems. For example, as shown in FIG. 4: 1) Part A' of material A drops after being cut off. 2) When a cutting-off tool B is pulled back straight after moved forward for cutting-off, it tends to be abraded by contact with the material A being machined which is rotating by inertia, on a supporting chuck.
Concerning the first problem, if the material A' is inclined the moment it has been cut off, it might hit the cutting-off tool while dropping. This might damage a side cutting edge 6 at the righthand side of the Figure. Concerning the second problem, a side cutting edge 5 at the lefthand side might be worn or welded to the material A to be machined.
Such problems cannot be ignored in view of the fact that tools nowadays are made of expensive materials such as cemented carbide or a hard sintered compact which is even harder than the cemented carbide. But a tool which is free of these problems is yet to be found.
FIG. 5 shows a prior art cutting-off tool B. This tool B has an insert 1' brazed to a shank. A throw away type tool is also known in which the insert is detachable. In any case, since the cutting insert of the prior art cutting-off tool B has front and side cutting edges 4, 5 and 6 identical in shape to each other, it is difficult to evade both of the above-described problems caused to the side cutting edges 5 and 6.
It is an object of this invention to provide a cutting-off tool which has an ideal shape for obviating the abovesaid shortcomings.
In accordance with the present invention, one of the cutting edges at one side is chamfered by a width H1 whereas the cutting edge at the other side is chamfered by a width H2 and the widths H1 and H2 satisfy the following relations: H1 ≧H2, H1 >0.01 mm, H2 ≦0.5 mm
It is well-known that a cutting edge can be strengthened by chamfering it. According to this invention, the side cutting edge at one side which may possibly collide with a falling material is chamfered by an amount H1 (0.01 mm or more) which is larger than the amount by which the side cutting edge at the other side is chamfered to increase its resistance to breakage. Thus the cutting edge is less likely to break even if it collides with the material machined.
Since the side cutting edge at the other side has a chamfer amount H2 which is smaller than H1 within the range of 0.5 mm or less to keep its sharpness, the material to be machined will be ground if the tool gets into contact with the material when it returns to its original position. Thus wear owing to abrasion and welding will decrease.
The chamfer amount H1 of the first-mentioned side cutting edge is limited to 0.01 mm or over. This is because though the smaller the H1 value, the higher the sharpness of the edge, experimental results revealed that if the H1 value is less than 0.01 mm, the edge tends to be broken more easily. Also, although the larger the H2 value, the higher the strength of the edge, if the H2 value is more than 0.5 mm, the sharpness of the edge is reduced remarkably.
With the cutting-off tool according to this invention, the side cutting edge which may collide with the material to be machined is chamfered sufficiently to prevent it from being broken, whereas the other side cutting edge is chamfered to a lesser degree to assure its sharpness. Thus the former side cutting edge is prevented from breaking and the other side edge is effectively prevented from wearing and welding. This will assure effective use of the tool.
Other features and objects of the present invention will become apparent from the following description taken with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of an embodiment according to this invention;
FIG. 2 is an enlarged plan view of the insert showing its edge;
FIG. 3 is a sectional view taken along line III--III of FIG. 2;
FIG. 4 is a perspective view showing how a material is cut off;
FIG. 5 is a perspective view of a prior art cutting-off tool;
FIG. 6 is a diagram of a side cutting edge showing its round honed shape; and
FIG. 7 is a diagram of a front cutting edge showing its round honed shape.
FIGS. 1 to 3 show a throw away cutting-off tool embodying this invention.
In these Figures, a throw away insert 1 and a clamp type holder 10 are shown.
The insert 1 has a front cutting edge 4 formed by the ridge line defined by a rake face 2 and a front flank 3, and side cutting edges 5 and 6 having their front ends connecting to both ends of the front cutting edge 4. The side cutting edge 5 at one side is formed by the ridge line defined by a side flank 7 and the rake face 2 and is subjected to round honing so as to be chamfered by a width H2 (FIG. 3). The side cutting edge 6 at the other side is formed by the ridge line defined by a side flank 8 and the rake face 2 and is subjected to round honing so as to be chamfereed by a width H1. The chamfered surface may be flat. In either case, the H1 and H2 values should be determined to meet the requirements that the minimum value of H1 is 0.01 mm, the maximum value of H2 is 0.5 mm, and H1 >H2.
In the Figures, numeral 9 designates a chip breaker groove. It serves to deform the chips in such a direction as to separate than from the surface to be machined. This facilitates chip discharge.
FIG. 6 shows a preferable shape of the chamfer of the side cutting edges 5 and 6 formed by round honing. In this Figure, the H1 and H2 values are within the aforementioned range. But preferably they should satisfy not only the relation, H1 >H2 but also the conditions of H2 =0.02-0.04 mm, H1 =0.04-0.06 mm, θ (angle of chamfer) should be 40-60 degrees.
FIG. 7 shows a preferable shape of the chamfer of the front cutting edge 4 formed by round honing. Among the radii of curvature at various portions of the chamfer, R0 is larger than R1 and R2 . Also, R1 should be 0.04-0.06 mm, H3 should be 0.08-0.12 mm and θ1 should be 8-15 degrees.
Such a round honed surface can be machined by pressing a disk-shaped brush grindstone with resin filaments containing diamond grains so that the filaments will contact the flank first and move off the insert from the rake face.

Claims (3)

What is claimed is:
1. A cutting-off tool for cutting off a section of a workpiece; said tool having an insert defining a first side cutting edge and a second side cutting edge; each of said first and said second side cutting edges being formed by ridge lines defined by a rake face and side flanks; said first side cutting edge being located proximate to and immediately adjacent to the cut-off section of the workpiece; said first side cutting edge being chamfered by a width H1 ; said second side cutting edge being chamfered by a width H2 ; said widths H1 and H2 satisfying the following relations:
H1 >H2 ;
H1 ≧0.01 mm; and,
H2 ≦0.5 mm.
2. A cutting off tool as claimed in claim 1 in which said insert further has a front cutting edge defined by a ridge line defined by said rake face and a front flank.
3. A cutting off tool as claimed in claim 2 in which said front cutting edge is chamfered by a width H3 in the range of 0.08 to 0.12mm.
US07/552,686 1989-07-18 1990-07-11 Cutting-off tool Expired - Lifetime US5135336A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1-185667 1989-07-18
JP1185667A JP2519801B2 (en) 1989-07-18 1989-07-18 Parting off tool

Publications (1)

Publication Number Publication Date
US5135336A true US5135336A (en) 1992-08-04

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US07/552,686 Expired - Lifetime US5135336A (en) 1989-07-18 1990-07-11 Cutting-off tool

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US (1) US5135336A (en)
EP (1) EP0409143B1 (en)
JP (1) JP2519801B2 (en)
KR (1) KR930003533B1 (en)
DE (1) DE69005931T2 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421679A (en) * 1992-02-05 1995-06-06 Sandvik Ab Cutting insert having a flat edge surface for supporting the insert in a tool holder
US5423639A (en) * 1992-10-28 1995-06-13 Sandvik Ab Cutting insert for chipforming machining of workpieces
EP0775544A1 (en) 1995-11-23 1997-05-28 Sandvik Aktiebolag Cutting insert for grooving and for the widening of grooves
US5638728A (en) * 1995-05-11 1997-06-17 Kaiser Tool Company, Inc. Replaceable tool support with arcuately curved surface portion
US6238147B1 (en) 1998-05-22 2001-05-29 Sandvik Aktiebolag Cutting insert for grooving
US6447219B1 (en) 1999-09-16 2002-09-10 Sandvik Aktiebolag Cutting insert for grooving
WO2003070419A1 (en) * 2002-02-19 2003-08-28 Manchester Tool Company Cutting insert
US6715968B1 (en) 1998-09-09 2004-04-06 Sandvik Aktiebolag Cutting insert for grooving operations
WO2018077508A1 (en) 2017-02-03 2018-05-03 Sandvik Intellectual Property Ab Blade portion for a metal cutting grooving tool
WO2018082821A1 (en) 2017-02-03 2018-05-11 Sandvik Intellectual Property Ab Method of machining a groove
US20190061016A1 (en) * 2017-08-30 2019-02-28 Tungaloy Corporation Cutting tool
US20190091772A1 (en) * 2017-09-28 2019-03-28 Tungaloy Corporation Cutting tool
US20190232378A1 (en) * 2016-11-07 2019-08-01 Sumitomo Electric Hardmetal Corp. Cutting-off processing tool
US10562104B2 (en) * 2017-08-30 2020-02-18 Tungaloy Corporation Cutting tool
US11583933B1 (en) * 2017-01-19 2023-02-21 Consolidated Nuclear Security, LLC Shaped cutting tool and method of use to efficiently form a finished part

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1558431B1 (en) * 2002-10-18 2017-05-03 Kennametal Inc. Metal cutting insert with chip breaking surfaces
JP2010221351A (en) * 2009-03-24 2010-10-07 Sumitomo Electric Ind Ltd Tip for cutting edge replacement type cutting tool
CN103480872B (en) * 2013-09-23 2016-08-10 柳燕明 Cut off chamfering one lathe tool and the pipe cutting machine of clamped one time cut-out chamfering simultaneously
JP2015112681A (en) * 2013-12-11 2015-06-22 株式会社神戸製鋼所 Cutting tool for grooving work and method of grooving work using cutting tool
CN105149624B (en) * 2015-07-28 2017-09-29 广东欧珀移动通信有限公司 Process tool

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US2424041A (en) * 1945-11-08 1947-07-15 John Milton Luers Patents Inc Cutoff blade
US2502922A (en) * 1944-11-01 1950-04-04 Norton Co Cutting tool
US3656219A (en) * 1970-01-26 1972-04-18 United States Steel Corp Cutting tool
US4834592A (en) * 1987-09-04 1989-05-30 Kennametal Inc. Cutting insert with chip control

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US3152385A (en) * 1961-11-07 1964-10-13 Norton Co Ceramic tools
US4214846A (en) * 1978-09-26 1980-07-29 Fansteel Inc. Heavy duty insert
EP0428518A4 (en) * 1988-04-22 1992-02-19 E.I. Du Pont De Nemours And Company Monoclonal antibodies specific for the harvey, kirsten and n ras proteins and their use as diagnostic reagents

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Publication number Priority date Publication date Assignee Title
US2502922A (en) * 1944-11-01 1950-04-04 Norton Co Cutting tool
US2424041A (en) * 1945-11-08 1947-07-15 John Milton Luers Patents Inc Cutoff blade
US3656219A (en) * 1970-01-26 1972-04-18 United States Steel Corp Cutting tool
US4834592A (en) * 1987-09-04 1989-05-30 Kennametal Inc. Cutting insert with chip control

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421679A (en) * 1992-02-05 1995-06-06 Sandvik Ab Cutting insert having a flat edge surface for supporting the insert in a tool holder
US5441370A (en) * 1992-02-05 1995-08-15 Sandvik Ab Sintered powder cutting insert for chipbreaking machining
US5423639A (en) * 1992-10-28 1995-06-13 Sandvik Ab Cutting insert for chipforming machining of workpieces
US5638728A (en) * 1995-05-11 1997-06-17 Kaiser Tool Company, Inc. Replaceable tool support with arcuately curved surface portion
EP0775544A1 (en) 1995-11-23 1997-05-28 Sandvik Aktiebolag Cutting insert for grooving and for the widening of grooves
US5827017A (en) * 1995-11-23 1998-10-27 Sandvik Aktiebolag Chipforming metal cutting insert with ridges for squeezing a chip
US6238147B1 (en) 1998-05-22 2001-05-29 Sandvik Aktiebolag Cutting insert for grooving
US6715968B1 (en) 1998-09-09 2004-04-06 Sandvik Aktiebolag Cutting insert for grooving operations
US6447219B1 (en) 1999-09-16 2002-09-10 Sandvik Aktiebolag Cutting insert for grooving
WO2003070419A1 (en) * 2002-02-19 2003-08-28 Manchester Tool Company Cutting insert
US6742971B2 (en) * 2002-02-19 2004-06-01 Manchester Tool Company Cutting insert
CN100434233C (en) * 2002-02-19 2008-11-19 曼彻斯特工具公司 Cutting insert
US20190232378A1 (en) * 2016-11-07 2019-08-01 Sumitomo Electric Hardmetal Corp. Cutting-off processing tool
US10926337B2 (en) * 2016-11-07 2021-02-23 Sumitomo Electric Hardmetal Corp. Cutting-off processing tool
US11583933B1 (en) * 2017-01-19 2023-02-21 Consolidated Nuclear Security, LLC Shaped cutting tool and method of use to efficiently form a finished part
WO2018077508A1 (en) 2017-02-03 2018-05-03 Sandvik Intellectual Property Ab Blade portion for a metal cutting grooving tool
EP3357612A1 (en) 2017-02-03 2018-08-08 Sandvik Intellectual Property AB Method of machining a groove
EP3357613A1 (en) 2017-02-03 2018-08-08 Sandvik Intellectual Property AB Blade portion for a metal cutting grooving tool
DE202017006780U1 (en) 2017-02-03 2018-06-11 Sandvik Intellectual Property Ab Blade part for a tool for groove cutting in metal
US11247360B2 (en) 2017-02-03 2022-02-15 Sandvik Intellectual Property Ab Blade portion for a metal cutting grooving tool
WO2018082821A1 (en) 2017-02-03 2018-05-11 Sandvik Intellectual Property Ab Method of machining a groove
US11701714B2 (en) 2017-02-03 2023-07-18 Sandvik Intellectual Property Ab Method of machining a groove
US20190061016A1 (en) * 2017-08-30 2019-02-28 Tungaloy Corporation Cutting tool
US10507530B2 (en) * 2017-08-30 2019-12-17 Tungaloy Corporation Cutting tool
US10562104B2 (en) * 2017-08-30 2020-02-18 Tungaloy Corporation Cutting tool
US20190091772A1 (en) * 2017-09-28 2019-03-28 Tungaloy Corporation Cutting tool

Also Published As

Publication number Publication date
JPH0349803A (en) 1991-03-04
JP2519801B2 (en) 1996-07-31
EP0409143B1 (en) 1994-01-12
KR910002550A (en) 1991-02-25
EP0409143A3 (en) 1991-04-17
DE69005931D1 (en) 1994-02-24
DE69005931T2 (en) 1994-04-28
EP0409143A2 (en) 1991-01-23
KR930003533B1 (en) 1993-05-03

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